# File lib/uuidtools.rb, line 316
    def nil_uuid?
      return false if self.time_low != 0
      return false if self.time_mid != 0
      return false if self.time_hi_and_version != 0
      return false if self.clock_seq_hi_and_reserved != 0
      return false if self.clock_seq_low != 0
      self.nodes.each do |node|
        return false if node != 0
      end
      return true
    end